what if he has not got the other people in the basemet?

Pretty much in a nutshell

Well if you mean getting all the ghosts, first the Air one ull use the other air ghost uv
got and use the shattering song thing.The poor ghost stuck in the toilet u need to use
tremor near the outhouse to get rid of the beehive and let the Mortals do the rest. The
third ghost downstairs ull have to let her show herself somehow to the mortals and thats
all.
To get that diary thing down in sight use the "hover" thing that Boo can use.